PL.01 Install guide NeoForge 1.21.1
A modded Minecraft server built around Create — gear-driven factories, trains, steam-powered contraptions. To get in, you need the modpack: follow one of the two methods below, it only takes a few minutes.
play.cogtopia.games
Java 21 is downloaded automatically by both launchers — you don't have to install anything yourself.
A “vanilla” Minecraft client is rejected automatically. You can't join without the modpack installed — that's normal, the server checks the mods on connection.
On TLauncher? Don't use its built-in modpack browser. The “Cogtopia” pack listed there is a fake by another author — it has the wrong mods and the server will reject it on join. Use an official method below; Prism Launcher works for free with offline accounts, just like TLauncher.
Two paths to the same destination. The first is free and works with an offline account; the second requires a premium Microsoft account. Pick one, you don't need both.
Best if CurseForge is slow or blocked for you
Install Prism Launcher (free, open-source).
Download our ready-made pack (button below) — one zip, ~112 MB.
In Prism: Add Instance → Import from zip, pick the file. It sets up NeoForge 1.21.1 and every mod for you.
Launch, Add Server play.cogtopia.games, join. First time: /trigger register set <number>.
Open-source · free · Offline account accepted
Download the launcher from prismlauncher.org/download and install it.
Add an account: Microsoft, or Offline by simply picking a username.
Click Add Instance, open the CurseForge tab and search “Cogtopia SMP” (or use the 1-click pack above).
Install it — Prism fetches NeoForge 1.21.1 and all the mods on its own.
Launch the instance, then Add Server and paste the address play.cogtopia.games.
Search “Cogtopia SMP” & install — now live on CurseForge
Download the app from curseforge.com/download/app.
Open Minecraft → Browse Modpacks and search “Cogtopia SMP”.
Hit Install — it sets up NeoForge 1.21.1 and every mod for you (1 click).
Press Play to launch the modpack (NeoForge 1.21.1).
In Minecraft: Add Server and paste play.cogtopia.games.
No search results? Fallback: Create Custom Profile → Import the zip below.
Open a .mrpack file — done
Install the Modrinth App (free).
Download our pack .mrpack (button below) — one file, ~136 MB.
Open the file with the Modrinth App (or in the app: + Add instance → From file). It sets up NeoForge 1.21.1 and every mod.
Launch, then Add Server play.cogtopia.games and join.
Our modpack on CurseForge: cogtopia-smp · based on Just Create SMP 2
Two last details the moment you arrive on the server — then you're free to build.
The server uses the Auth mod. On your first connection, type in chat (press T):
Your password is a number you choose (e.g. 2468) — set it once. To reconnect later: /trigger login set <number> (the same number).
The server ships with Simple Voice Chat, already included in the modpack. No setup needed: plug in a mic and talk proximity-style with the players around you.
You can open the voice settings in-game with the V key if you need to pick your mic.
The most common blockers and how to get past them.
You're probably launching a vanilla Minecraft without the mods. The server only accepts the Cogtopia modpack: make sure you launch it from Prism Launcher, CurseForge or the Modrinth app, never from the plain official launcher.
No. Java 21 is downloaded and configured automatically by both Prism Launcher and the CurseForge app. You don't have to touch anything.
Use Prism Launcher with an Offline account: you pick a username and you can play. The CurseForge app, on the other hand, requires a premium Microsoft account.
In Minecraft's multiplayer menu, click Add Server, give it a name, and paste the exact address play.cogtopia.games into the address field. No port to add.
Right here on this page — see Install above (Prism, CurseForge or Modrinth), or grab it at play.sitecreator.shop. Make sure the version is NeoForge 1.21.1.
That pack in TLauncher's browser is not ours — it's a fake by another author with the wrong mods (you'll often see an error about Create: Connected missing on the server). Don't try to fix it mod-by-mod; install the official pack instead with Prism Launcher (free, offline accounts) from the Install section above, then add play.cogtopia.games.
Cogtopia is free and open to everyone. If you enjoy the server, you can support it — it helps pay for hosting and keep the project alive. Any amount, secure payment via Stripe. Thank you!
♥ Donate
The modpack is installed, the account is ready. Copy the address, add the server, and join the workshop.
play.cogtopia.games